We can source the value in the child record to the field in the parent record using search. Whenever the user changes in the body field of a parent record when value changes in the child record using saved search is possible. Without using any script the value in the child record is updated in the body field in the parent record. Create the saved search for the child record in the UI and follow the steps:-
- Select preferred field.
- Add summary type maximum
- Add “When ordered by field” as Date created to get the latest updated the value in the sublist.
- In available filter, add the unique identifier for mapping the child records.
- Save
- Then customize the body field in the parent record.
- source this search in the corresponding body field.